If callbackFn never returns a truthy value, findIndex() returns -1.ĬallbackFn is invoked for every index of the array, not just those with assigned values. findIndex() then returns the index of that element and stops iterating through the array. ![]() It calls a provided callbackFn function once for each element in an array in ascending-index order, until callbackFn returns a truthy value. Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.
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